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The boys volunteer three hours     up the park near their school.A. cleaning B. to clean C. cleaned...

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Three-fifth, is  Three-fifths, is  Three fifth, are  Three-fifths, are  
three hour  a three-hours   a three-hour  three hours  
a three hour    a three hour’s    a three­-hours    a three-­hour  
Three hour    a three hour’s   a three-hours   a three-hour  
three and a half hour  three and half an hour  three and a half hours  three hours and half an hour  
four-hour; three-fourthes    four-hour; three-fourths    four-hours; three -fourths   four-hours; three-four  
three-hours    three-hour    three-hours'    three-hour's  
three hour    a three-hours    a three-hour    three hours  
a three-hour    a three hour    three hour    three hours  
one and half hour    one and half a hour      one and a half hours    one and half hours  
one and half hour    one and half a hour    one and a half hours    one and half hours  
three hour    a three-hours    a three-hour    three hours  
three hour    a three-hours    a three-hour    three hours  
three-hours  three-hour  three-hours'  three-hour' s  
cleaning    to clean    cleaned    with cleaning  
three-hours  three-hour  three-hours'  three-hour' s  
three hour  a three-hours  a three-hour  three hours  
three hour    a three hour’s    a three-hour    three hours  
three hour’s worth    three hours’ worth    three hours’ worthy    three hour’s worthy  
three quarter of an hour time  three quarters of an hour time  three quarter of an hour's time  three quarters of an hour's time  

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